Dr. Tom Douglas Spies (September 21, 1902 in Ravenna, Texas – February 28, 1960 in New York, NY) was a distinguished American physician and medical educator. Dr. Spies was an authority in the study of nutritional diseases. In the 1930s, he contributed significantly to finding a cure for pellagra, a nutritional disease that once afflicted millions in the American South. Later, he also made a large contribution to finding cure for tropical sprue. For his efforts in elimination of pellagra, Time Magazine named him as 1938 "Man of the Year" in comprehensive science.